diff --git a/src/DynamoCore/Graph/Nodes/PortModel.cs b/src/DynamoCore/Graph/Nodes/PortModel.cs
index 481a060cd93..2e404eef09f 100644
--- a/src/DynamoCore/Graph/Nodes/PortModel.cs
+++ b/src/DynamoCore/Graph/Nodes/PortModel.cs
@@ -473,17 +473,19 @@ internal string GetInputPortType()
         {
             if (PortType == PortType.Output) return null;
 
-            if (Owner is DSFunction ztNode)
+            if (Owner is DSFunctionBase ztNode)
             {
                 var fd = ztNode.Controller.Definition;
                 string type;
+                var parameters = fd.Parameters.ToList();
                 // In the case of a node for an instance method, the first port
                 // type is the declaring class type of the method itself.
                 if (fd.Type == FunctionType.InstanceMethod || fd.Type == FunctionType.InstanceProperty)
                 {
                     if (Index > 0)
                     {
-                        var param = fd.Parameters.ElementAt(Index - 1);
+                        var paramIndex = ztNode is DSVarArgFunction ? Math.Min(Index - 1, parameters.Count - 1) : Index - 1;
+                        var param = parameters.ElementAt(paramIndex);
                         type = param.Type.ToString();
                     }
                     else
@@ -493,7 +495,8 @@ internal string GetInputPortType()
                 }
                 else
                 {
-                    var param = fd.Parameters.ElementAt(Index);
+                    var paramIndex = ztNode is DSVarArgFunction ? Math.Min(Index, parameters.Count - 1) : Index;
+                    var param = parameters.ElementAt(paramIndex);
                     type = param.Type.ToString();
                 }
                 return type;
@@ -548,7 +551,7 @@ internal string GetOutPortType()
         {
             if (PortType == PortType.Input) return null;
 
-            if (Owner is DSFunction ztNode)
+            if (Owner is DSFunctionBase ztNode)
             {
                 var fd = ztNode.Controller.Definition;
 
diff --git a/src/Libraries/CoreNodeModels/CurveMapperNodeModel.cs b/src/Libraries/CoreNodeModels/CurveMapperNodeModel.cs
index 3045a1a5d82..c45728a6806 100644
--- a/src/Libraries/CoreNodeModels/CurveMapperNodeModel.cs
+++ b/src/Libraries/CoreNodeModels/CurveMapperNodeModel.cs
@@ -20,6 +20,7 @@ namespace CoreNodeModels
     [NodeSearchTags("CurveMapperSearchTags", typeof(Properties.Resources))]
     [InPortNames("x-MinLimit", "x-MaxLimit", "y-MinLimit", "y-MaxLimit", "values")]
     [InPortTypes("int", "int", "int", "int", "double")]
+    [OutPortTypes("double[]", "double[]")]
 
     public class CurveMapperNodeModel : NodeModel
     {
diff --git a/src/Libraries/CoreNodeModels/Input/BaseTypes.cs b/src/Libraries/CoreNodeModels/Input/BaseTypes.cs
index c729ce70073..826b33c064a 100644
--- a/src/Libraries/CoreNodeModels/Input/BaseTypes.cs
+++ b/src/Libraries/CoreNodeModels/Input/BaseTypes.cs
@@ -19,6 +19,7 @@ namespace CoreNodeModels.Input
     [NodeName("String")]
     [NodeCategory(BuiltinNodeCategories.CORE_INPUT)]
     [NodeDescription("StringInputNodeDescription", typeof(Resources))]
+    [OutPortTypes("string")]
     [IsDesignScriptCompatible]
     [AlsoKnownAs("Dynamo.Nodes.StringInput", "Dynamo.Nodes.dynStringInput", "DSCoreNodesUI.Input.StringInput")]
     public class StringInput : String
diff --git a/test/DynamoCoreTests/CoreTests.cs b/test/DynamoCoreTests/CoreTests.cs
index 6b5408a9d76..b1cc3b162c2 100644
--- a/test/DynamoCoreTests/CoreTests.cs
+++ b/test/DynamoCoreTests/CoreTests.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -705,6 +705,43 @@ public void CanCopyAndPasteDSVarArgFunctionNode()
             });
         }
 
+        [Test]
+        [Category("UnitTests")]
+        public void DSVarArgFunctionPortsReportInputAndOutputTypes()
+        {
+            var concatNode = new DSVarArgFunction(CurrentDynamoModel.LibraryServices.GetFunctionDescriptor("DSCore.String.Concat@string[]"));
+
+            Assert.AreEqual("string[]", concatNode.InPorts[0].GetInputPortType());
+            Assert.AreEqual("string", concatNode.OutPorts[0].GetOutPortType());
+
+            var joinNode = new DSVarArgFunction(CurrentDynamoModel.LibraryServices.GetFunctionDescriptor("DSCore.String.Join@string,string[]"));
+            joinNode.VarInputController.AddInputToModel();
+
+            Assert.AreEqual("string", joinNode.InPorts[0].GetInputPortType());
+            Assert.AreEqual("string[]", joinNode.InPorts[1].GetInputPortType());
+            Assert.AreEqual("string[]", joinNode.InPorts[2].GetInputPortType());
+            Assert.AreEqual("string", joinNode.OutPorts[0].GetOutPortType());
+        }
+
+        [Test]
+        [Category("UnitTests")]
+        public void CurveMapperOutputsReportPortTypes()
+        {
+            var curveMapperNode = new CurveMapperNodeModel();
+
+            Assert.AreEqual("double[]", curveMapperNode.OutPorts[0].GetOutPortType());
+            Assert.AreEqual("double[]", curveMapperNode.OutPorts[1].GetOutPortType());
+        }
+
+        [Test]
+        [Category("UnitTests")]
+        public void StringInputOutputReportsPortType()
+        {
+            var stringNode = new StringInput();
+
+            Assert.AreEqual("string", stringNode.OutPorts[0].GetOutPortType());
+        }
+
         /// <summary>
         ///     Pasting an Input or Output node into the Home Workspace converts them
         ///     to a Code Block node.